Abstract
Heteroepitaxy of organic second-order nonlinear optical crystal MNBA (4′-nitrobenzylidene-3-acetamino-4-methoxyaniline) on its family crystal MNBA-Et (4,-nitrobenzylidene-3-ethylcarbonylamino-4-methoxyaniline) has been discovered and developed for guided-wave optics; Vapor phase deposition of MNBA on MNBA-Et crystal substrate (MNBA-Et wafer) afforded a single–domained, thin single crystal of MNBA over the whole area of the MNBA-Et wafer exposed (>1.5 cm2), with all the principal axes of refractive indices parallel to those of the wafer. The heteroepitaxy occurs in crystallographically almost coaxial manner. The high quality of MNBA crystal planar waveguide fabricated on (010)(y-cut) MNBA-Et wafer by MBE (Molecular Beam Epitaxy) has been shown by propagation of He-Ne laser light without apparent visible streak. The vapor phase heteroepitaxy has been proposed to be a potential technique which opens up a realistic way to sophisticated guided-wave devices for highly nonlinear organic crystals.
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